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Wed Mar 31 23:36:27 BST 2010

Surely an alternative explanation is that the more disciplined/mature and
professional as well as choosing stricter triage and flying rules also chose
the method to fly with two turbines and two pilots for very good reasons and
were therefore safer...

Simply because there's (even 100%) correlation between two (therefore
confounding) variables doesn't necessarily mean that only one is responsible
for the whole of the effect (and therefore won't show up in logistic
regression).

If there were HEMS organisations with drive/discipline/newer
helicopters/safer practices etc. etc. flying single pilot single engine
helicopters and achieving the same safety standards as the dual pilot ones
then that would be evidence that dual pilot dual turbine doesn't provide
additional safety but that doesn't seem to be what the study showed.

There are plenty of people with more experience of helicopters than me but
have yet to find anyone who believes flying single pilot is *safer* and as
you say most safety minded organisations (including HEMS London and the UK's
military (currently) and coastguard SAR helicopters) are dual pilot and I
can't recall the last time I heard one go down with the loss of it's crew
(plenty of mechanical failures but all recovered.)

If you want to fly over a city in the UK I believe you need to be double
engined anyway (I may be wrong on this).

Just my thoughts and I'm happy to be corrected or told I'm wrong.

All the best,
Tom Riley

On 30 March 2010 15:24, Charles Brault <c_brault at yahoo.com> wrote:

> The two pilot/two turbine research was shown to suffer a selection bias
> As more mature and professional units
> . . . were the ones with the resources and the drive/discipline to upgrade
> to the costlier models
>
> But, ir turns out, they also happen to be the ones with stricter triage and
> flying rules
>
> So the advantage of twin pilots/turbine (hardware) is largely diluted
> Inside a proper and measured HEMS approach (software)
>
>
> Charles
>
>
>
>
> ________________________________
> From: "listen at doc-kalkum.de" <listen at doc-kalkum.de>
> To: trauma-list at trauma.org
> Sent: Mon, March 29, 2010 3:37:08 PM
> Subject: Antw.: Professionalism in Air Ambulance Standards
>
> Stephen,
>
> Mathias, please. You're welcome!
>
> The number of pilots depends on type of the chopper (BL117 vs EC 1X5 etc)
> and mission (day vs night etc), so your information may well be correct.
>
> If you want to continue our chat - be my guest! I sent you my private mail.
>
> Cheers!
>
> Mathias
>
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Antw.: Professionalism in Air Ambulance Standards